Stop



March 11, 1952 w w co s 2,588,560

STOP

Filed NOV. 28, 1947 Fig.1

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Patented Mar. 11, 1952 UNITED STATES PATENT OFFICE This" invention ifllts' to the i 'eififddatdly filu'ngr' pul'hiis 11566 fof' iiijtifi'g" liquid fuel into internal COiiibilStiOfi ehgifil Su'liare ordinarily provided with manually" e eratea r governor-o erated fiiafis' for var in the quantiti of fuel injected at each dischargeto correst oridwith different load conditions. Al" tisto pi 'oi id such With ins-xis iivhefbii a quantity (if fife ineicess of the ffo'frneh'l imum can be injected for engine starting purposes. l

The object of the pfesi'it intentior'i is" to piov'ide improved means for controlling the supply of excess fuel, and fer" preventing the use o f such excess fuel eke'e'git for the fluifiose intended;

The invention cdiripf ise a laterally slidab'le Stop foi determining the maiamuhi sup-ply" nthtion o'fthepump r egi'ila'sting' means, a s iii i'ng for moving? the stop one direction and manually operable means; for moving it inthe opfiosite' dir'ection, the stop consisting of a; pair of parts one of which is niovable rlati-ife to the other, and the arrangementbi'ng- Siich that the amount of exd'ss" fuel that can be Supplied is} deter'fliined b3? the relatively movablefial-t- Of the stop; the normalnia'ximufii' supply Being determined by the other part of the stop, and the said latter part being automatically movable to its operative positionby the" spring. According to' a further feature of the invention the movable part of the stop is spring loaded and is engageable with a groove of shoulder when the stop-is moved to the" excess fuel Supply position, said part being disengaged when the pump regulating means is moved to increase the fuel supply so that when such're'gulating means is returned to normal position the stop i's'moved lateral-131 by its spring to a, position which limits" the maximum supply to'normal. v

According to a further f''a-tur of the invert tion, the part of the stop which detei rhihes th'e excess fuel: supply" is pivotally mounted on the other part and istafefetahly' located 'a slot therein; the stop being slidable laterally in a di-* rection pa allel to the pivotal axis 6fthe" said movable part; In the" preferredarrangement; the stop; is": slida'bly' mounted on a post or like member and is also capable of pivotal movement for adjustment purposes, the adjustment being effected by ascrew mounted-in afixed casing and bearing against the stop. I I

According to a further feature of the invention, the adjusting screw has" a collar bearing against-a part of the casing to prevent adtus't went in a direction corresponding to increased fuel supply. p v

In the accompanying drawings; Figure 1 is at s'ectional ele'vatio of "de' ce fbr can 'll-ihg "ctionhump'sasusw thrdueh which the ost ji passes. I

is resisonsitet'd' the action of niariuall'y mean 61 ag'ovjer'nor in the-usual Ii'ia-nner. the end of the ban 2 iirevided abutment in the forirr of an adjustabl scr e s having a duced en i got cof-ol'a'erating' with the stat he s ew heme threaded in a hrackt 5" Secure to axis oi the said bar. Adjacent to the said abht= is arranged a fiied' shine-piece the" fdi'zn of hort cylindrical ast 1, t heiri heatediii'ithits ax s at right-enigma to he a is 6: the reg lating" bar 2; on' this pest sliqabi mbhh ed the stop; The new part of thestop co s i' s t's' of an rm a of fo examine, ubs "ti'a-il ii triangular r rm; and hav nga hole ear its apex a is ahg-uiariy meva ie Qh the pest for' adjustfiient purposes: but after the adjhstihent teeterftd s onli'flfree" to s ide on the host; e ge of the arm s reee seaat s and abuts g t theiniierfend' d m adj'iistmeiit scr''w lli'inserted through the Wall 0: the enclosing housing I. The opp-c5113 edge of the arm is; formed with h sse- 7 fiivotall'y' ac'o V the secon part1: of the stopw'iihi'ch' is- 10 e1; a 'bril'ig i3" carried by the mamstop part 8. ,Tliisf second step part may be of any convenient Shape; tha sriow'n, and hasa' hose afiordi' sur ace [4 which is'st'liacl'i slightly With res-p t" I 5 which may be engaged by the rearfr when so en? of the pivot u stob part if she firet'ents sliding" movement of th Stop on post. Aspring i6 surrounding the l'owi'end b1 11 db in mg the past is rranged to Y ,m sto e; part tact with the second stop part I2.

3 abutment screw 3 of the pump regulating bar. The stop is temporarily held in this position by the engagement of an edge of the second stop part I2 (under the action of spring I3) with the. groove I5. The regulating bar 2 is then moved to bring the end 4 of the abutment screw 3 into contact with the face I4 of the second stop part I2, and the latter is thereby rocked against the action of its spring I3, allowing the bar to take to prevent re-engagement of the stop part with the groove when the regulating bar is subseguently moved in the direction for reducing the fuel supply. This slight movement of the stop is permitted by the fact that the diameter of the end 4 of the screw 3 is slightly smaller than the width of the slot in the main part 8 of the stop in which the second stop part is accommodated. Moreover, the above mentioned slight movement of the stop is sufficient to bring the second stop part I2 slightly out of register with the groove I5.

' After the engine has been started, the regulating bar 2 is moved either by hand or by the governor in the direction for reducing the'fuel supply. Thismovement of the regulating bar brings the end 4 of the screw 3 clear of the stop, and allows the latter to be moved by its spring I6 to a position in which an edge of the main stop part 8 is brought opposite the abutment screw 3. Thereafter and so long as the engine is in action, the maximum amount of fuel that can be sup- Dlied to the engine is determined by the main *smp part 8, this amount being less than that available when the abutment screw was in con- It will be understood that in the position in which the parts are shown in the drawings, the regulating bar may be moved into the excess fuel supply position. To prevent the attendant from permanently obtaining an excess amount of fuel during normal running of the engine by altering the adjustment or the screw I which supports one side of the stop, a collar I9 is formed on the screw and said collar .is initially caused to abut against the inner face of the housing I as shown, which consequently. prevents thescrew from being turned to a position that would enable extra fuel to be obtained. The only adjustment of this screw available to the attendant is rotation in the direction for reducing the'predetermined maximum fuel supply.

' By this. invention the required provision for enabling the pump to give an extra fuel supply for engine starting purposes can be effected in a very simple and convenient manner.

' Having thus described my invention what I claim as new and desire to secure by Letters Patent is: v Y 1. A device for limiting motion in one direction of a member capable of movement in two opposite directions, comprising the combination with said member, of a stop composed of two relatively movable parts, a support along which said stop is movable between two service positions in which said parts serve respectively as abutments for said member, manually operable means for moving said stop from one of said service positions to the other, and a spring arranged to oppose movement of said stop by said manually operable means and to return said stop to its initial position.

2. A device for limiting motion in one direction of a member capable of movement in two opposite directions, comprising the combination with said member, of a stop composed of a pair of parts one of which is movable relatively to the other, a

support along which said stop is movable between two service positions in which said parts respectively serve as abutments for said member, manually operable means for moving said stop from one of said service positions to that in which the relatively movable stop part serves as the abutment for said member, said relatively movable stop part being engageable with said support to retain said stop in the service position into which it is movable by said manually operable means,

. and being disengageable from said support by said member, and a spring arranged to oppose movement of said stop by said manually operable means and to return said stop to its initial position after disengagement of said relatively movable stop part from said support.

' 3. A device forlimiting motion in one direction of a member which is slidable in two opposite directions, comprising the combination with said member, of a, stop composed of a pair of parts one of which is pivoted on the other, a post which is arranged transversely to said member and along which said stop is movable between two service positions wherein said parts respectively serve as abutments for said member, said post being formed with a circumferential groove adjacent to one of said service positions of said stop, a spring acting on the pivotal stop part in the direction for causing it to engage said groove when said stop occupies the appropriate service position, manually operable means for moving said stop to the latter service position in which said stop is retainable by the engagement of said pivotal stop with said groove, said pivotal stop part being disengageable from said groove by said member, and a second spring arranged to oppose movement of saidstop by said manually operable means and to return said stop to its initial position after disengagement of saidpivotal stop part from said groove.

4. A device as claimed in claim 3, in which said stop is angularly movable on said post, and has associated with it an adjustable member for effecting angular adjustment of said stop relatively to said post. 5. A device as claimed in claim 4 and having a fixed support carrying said adjustable member, and a collar provided on said adjustable member to cooperate with said support for limiting movement of said adjustable member in one direction.

WILFRID EDWARD WALTER NICOLLS.

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